Improvement in cutter-heads for planing and molding machines



l. SHIMER.

Cutter-Heads for PlagjlfingandMoldingfMachnes.

'9 Patented my 21,1875.

WITJVESSES ,PETEHS, PNGTO-LITHDGRAFHER, WASHINGTON. D C.

UNITED STATES PATENT OFFICE.

GEORGE J. SHIMER, OF MlLTON, PENNSYLVANIA.

IMPROVEMENT IN CUTTER-HEADS FOR PLANING AND MOLDING MACHINES.

Specification forming part of Letters Patent No. 166,035, dat-ed July 27, 1875; application iled December 30, 1874.

To all whom it may concer/n;

Be it known that I, GEO. J. SEIMER, of Milton, in the county of Northumberland and State of Pennsylvania, have invented certain Improvements in CutterHeads for Planing and Molding Machines, of which the following is a specilication:

My invention relates to that class of cutterliead bits which are circular in outline, with a cuttinglip formed by notching the edge of the bit, and with a central orifice for a stud or bolt whereby the bit is attached to the cutter-head; and it consists, first, in a bit formed of a circular plate or disk, Which may be struck up in properly-formed dies sufficiently thick to form the required cuttingedge, and thin in the central part or web, as will be here inatter described.

Figure lis a plan of one of my bits. Fig. 2 represents four of said cutters in proper relative position for operation. Fig. 3 is a transverse section showing the same. Fig. 4 is a perspective showingl the complementary or grooving cutters.

A is the bit with its'face turned up to the required shape, and with the cross-notch a to form the cutting-lip b.

lt is desirable to make the cutting-edge a little oblique to the line of advance, so as to produce a drawcut; but with bits ofrthis kind as hitherto made, if the cutting edge has been made'oblique, it `would produce an inequality of cut as respects the two sides of a grooving-bit.. My bits are `placed alternately face and back outward, as shown in Figs. 2 and 3, so that the sides of the tongue are alternately cut.

Heretofore bits of like description have been constructed with the central portion not less in thickness than the cutting-edge; hence the cutting portion is entirely outside of its solid support. I propose to improve the bit by reducingthe thickness of its Vcentral part as much as is consistent With strength, so as to make the said central part a web only, as at e, and thereby the solid portion of the cutterhead to which said bit is secured niay be advanced within the outer line of cut, and the bit will receive a correspondingly-Ermer support. On the opposite side, likewise., the head of the holding-boltf is brought within the in ner line of cut, and the length of bolt subjected to the strain of the bit in operation is correspondingly reduced, and its effective strength increased.

In addition to the advantages above named there are further material advantages incident to the structure described, viz., less metal is required to form the bits with a thin web; less labor will be required, because they can be forged up with the drop-hammer, and only require face-finishing upon the lathe; a better temper can be secured, because ofthe less 

